package com.poicom.basic.kit.thread;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;

public class AttemptLocking extends Printer{
	private ReentrantLock lock = new ReentrantLock();
	public void untimed(){
		boolean captured = lock.tryLock();
		try{
			print(" tryLock(): " +captured);
		}finally{
			if(captured){
				lock.unlock();
			}
		}
	}
	public void timed(){
		boolean captured = false;
		try{
			captured = lock.tryLock(2, TimeUnit.SECONDS);
		}catch(InterruptedException e){
			throw new RuntimeException(e);
		}
		try{
			print(" tryLock(2,TimeUnit.SECONDS): " + captured);
		}finally{
			if(captured){
				lock.unlock();
			}
		}
	}
	public static void main(String[] args){
		final AttemptLocking al = new AttemptLocking();
		al.untimed();
		al.timed();
		new Thread(){
			{setDaemon(true);}
			public void run(){
				al.lock.lock();
				System.out.println(" acquired");
			}
		}.start();
		Thread.yield();
		al.untimed();
		al.timed();
	}

}
